<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.number="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="btnAddR">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in arr" :key="index">
          <td>{{ item.id }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.sex }}</td>
          <td>
            <button @click="btnDel(index)">删除</button>
            <button @click="btnRemake(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      flag: false,
      id: 0,
      name: "",
      age: "",
      sex: "",
      arr:JSON.parse(localStorage.getItem("pArr")),
      // arr: [
      //   {
      //     id: 1,
      //     name: "Tom",
      //     age: 19,
      //     sex: "男",
      //   },
      // ],
    };
  },
  methods: {
    btnAddR() {
      if (this.name.trim().length == 0 || this.age == 0 || this.sex == "") {
        alert("不能为空!");
        return;
      }
      let id = this.arr.length > 0 ? this.arr[this.arr.length - 1].id + 1 : 1;
      if (!this.flag) {
        this.arr.push({
          id: id,
          name: this.name,
          age: this.age,
          sex: this.sex,
        });
        this.name='';
        this.age='';
        this.sex='';
      } else if (this.flag) {
        this.arr.splice(this.id - 1, 1, {
          id: this.id,
          name: this.name,
          age: this.age,
          sex: this.sex,
        });
        this.name='';
        this.age='';
        this.sex='';
        this.flag = false;
      }
    },
    btnDel(index) {
      // console.log(index);
      return this.arr.splice(index, 1);
    },
    btnRemake(index) {
      this.id = this.arr[index].id;
      this.name = this.arr[index].name;
      this.age = this.arr[index].age;
      this.sex = this.arr[index].sex;
      this.flag = true;
      // console.log(this.flag);
      // console.log(this.id);
      return;
    },
  },
  watch: {
    arr: {
      // 侦听list列表，将数据存入本地
      handler() {
        localStorage.setItem("pArr", JSON.stringify(this.arr));
      },
    },
    deep: true,
  },
};
</script>